Axil
Prince
the tech leak isn't firaxis it's from a mod - btw try this for a laugh - make a civ with it's cultural boundarys in a circle then build the great wall in a city which is nearer the inner ring boundary than the outer one and hey presto a great wall than encirvle the land inside your civ and not the outer boundary and looks totally useless ( ever get the feeling the great wall on map script wasn't well implemented? )